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参数资料
| 型号： | MAX4073TAUT-T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 电源管理 |
| 英文描述： | Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier |
| 中文描述： | POWER SUPPLY SUPPORT CKT, PDSO6 |
| 封装： | SOT-23, 6 PIN |
| 文件页数： | 7/10页 |
| 文件大小： | 261K |
| 代理商： | MAX4073TAUT-T |
Detailed Description
The MAX4073 high-side current-sense amplifier fea-
tures a +2V to +28V input common-mode range that is
independent of supply voltage. This feature allows the
monitoring of current out of a battery as low as +2V and
also enables high-side current sensing at voltages
greater than the supply voltage (V
CC
).
The MAX4073 operates as follows: current from the
source flows through R
SENSE
to the load (Figure 1). Since
the internal-sense amplifier
’
s inverting input has high
impedance, negligible current flows through RG2
(neglecting the input bias current). Therefore, the
sense amplifier
’
s inverting-input voltage equals
V
SOURCE
- (I
LOAD
)(R
SENSE
). The amplifier
’
s open-loop
gain forces its noninverting input to the same voltage as
the inverting input. Therefore, the drop across RG1
equals (I
LOAD
)(R
SENSE
). Since I
RG1
flows through RG1,
I
RG1
= (I
LOAD
)(R
SENSE
) / RG1. The internal current mirror
multiplies I
RG1
by a current gain factor,
β
, to give
I
RGD
=
β
I
RG1
. Solving I
RGD
=
β
(I
LOAD
)(R
SENSE
) /
RG1. Assuming infinite output impedance, V
OUT
= (I
RGD
)
(RGD). Substituting in for I
RGD
and rearranging, V
OUT
=
β
(RGD / RG1)(R
SENSE
I
LOAD
). The parts gain equals
β
RGD / RG1. Therefore, V
OUT
= (GAIN) (R
SENSE
)
(I
LOAD
), where GAIN = 20V/V for MAX4073T, GAIN =
50V/V for MAX4073F, and GAIN = 100V/V for MAX4073H.
Set the full-scale output range by selecting R
SENSE
and
the appropriate gain version of the MAX4073.
Applications Information
Recommended Component Values
The MAX4073 senses a wide variety of currents with
different sense resistor values. Table 1 lists common
resistor values for typical operation of the MAX4073.
Choosing R
SENSE
To measure lower currents more accurately, use a
large value for R
SENSE
. The larger value develops a
higher-sense voltage that reduces offset voltage errors
of the internal op amp. Typical sense voltages range
between 10mV and 150mV.
In applications monitoring very high currents, R
SENSE
must be able to dissipate the I
2
R losses. If the resistor
’
s
rated power dissipation is exceeded, its value may drift
or it may fail altogether, causing a differential voltage
across the terminals in excess of the absolute maxi-
mum ratings (±5V).
If I
SENSE
has a large high-frequency component, mini-
mize the inductance of R
SENSE
. Wire-wound resistors
have the highest inductance, metal-film resistors are
M
Low-Cost, SC70, Voltage-Output,
High-Side Current-Sense Amplifier
_______________________________________________________________________________________
7
Pin Description
PIN
SOT23-6
1, 2
3
4
5
SC70-5
2
3
4
5
NAME
FUNCTION
GND
V
CC
RS+
RS-
Ground
Supply Voltage Input. Bypass to GND with a 0.1
μ
F capacitor.
Power-Side Connection to the External Sense Resistor
Load-Side Connection to the External Sense Resistor
6
1
OUT
Voltage Output. V
OUT
is proportional to V
SENSE
. Output impedance is approximately
12k
.
R
SENSE
V
SOURCE
+2V TO +28V
+3V TO +28V
RGD
= 12k
V
OUT
I
RG1
I
RGD
I
LOAD
R
G1
R
G2
RS-
RS+
OUT
GND
TO LOAD/BATTERY
V
CC
CURRENT
MIRROR
A1
MAX4073T/F/H
Figure 1. Functional Diagram
相关PDF资料 |
PDF描述 |
|---|---|
| MAX4073FAUT-T | MS/STANDARD CYLINDRICAL MIL-C-5015 TYPE CONNECTORS, STRAIGHT BODY STYLE, SOLDER TERMINATION, 14S SHELL SIZE, 14S-5 INSERT ARRANGEMENT, PLUG GENDER, 5 CONTACTS |
| MAX4073HAUT-T | Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier |
| MAX4073 | Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier |
| MAX4073T | Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier |
| MAX4073FAXK-T | Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4073TAXK | 制造商:Maxim Integrated Products 功能描述:VOLTAGE-OUTPUT, HIGH-SIDE CURRENT-SENSE AMPLIFIER - Rail/Tube |
| MAX4073TAXK+ | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:SP AMP CURRENT SENSE AMP SGL 28V 5PIN SC-70 - Rail/Tube |
| MAX4073TAXK+G65 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4073TAXK+T | 功能描述:电流灵敏放大器 Voltage-Output High Side Crnt-Sense Amp RoHS:否 制造商:Texas Instruments 通道数量: 共模抑制比（最小值）:110 dB 输入补偿电压:80 uV 电源电压-最大:5.5 V 电源电压-最小:2.7 V 电源电流:350 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-16 封装:Reel |
| MAX4073TAXK+TG65 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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